given the addition of breaks:mlocate to plocate, a sid box will delete
mlocate when upgrading plocate, but a ceres box instead will refuse to
update plocate when both are installed.

re-running /apt install plocate/ did the right thing.

not sure which behaviour is generally preferred,
but i prefer what sid did.

(same behaviour on multiple arch; only deb v. dev was different.)

-JimC
-- 
James Cloos <cloos@???>         OpenPGP: 0x997A9F17ED7DAEA6